Solid-State Electronics, Vol.80, 14-18, 2013
Structural spectral response tuning in organic deep ultraviolet photodetectors
We demonstrated novel organic deep ultraviolet photodetectors with structural spectral response tuning through bulk heterojunctions (His) and mixed planar-bulk His (PBHJs), respectively. TAPC and BAlq were utilized as the electron donor and acceptor, as well as polymer PEDOT:PSS was present as the transparent anode. The mixed PBHJs and bulk His reveal extremely low dark current of 3.35 x 10(-8) and 2.94 x 10(-8) A/cm(2), and high photocurrent of 3.01 x 10(-5) and 9.55 x 10(-5) A/cm(2) at -10 V under 260 nm light illumination with an intensity of 0.91 mW/cm(2), respectively. A peak response of 33.6 mA/W at similar to 260 nm and a detectivity of 3.24 x 10(11) cm Hz(1/2) W-1 are achieved in the mixed PBHJs. The bulk His exhibit a maximum response of 100.8 mA/W at similar to 280 nm and a detectivity of 1.04 x 10(12) - cm Hz(1/2) W-1. The photophysics involved in structural spectral response tuning are also discussed in detail. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.